Furnace-grate



(No Model.)

J. L. MASON. FURNACB GRATE.

Patented Aug. 16, 1892.

WIN/8858:

By MMM-v :s ruins co., wo

UNITED STATESv PATENT OFFICE.

JOHN L. MASON, OF BROOKLYN,NE\V YORK.

FU RNACE-GRATE.

SPECIFICATION formingpart of Letters Patent No. 480,952, dated August 16, 1892.

Application tiled August 7, 1891. Serial No. 401,965. (No model.)

T0 all whom it may concern:

Be it known that I, JOHN L. MASON, a citizen of the United States, and a resident of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Furnace-Grates, of which the following is a specification.

My invention relates especially to that class of furnace-gratos incorporating longitudinally-movable grate-bars and arocking cross-bar for operating the same; and it consists of certain novel features of construction for producing various advantageous results, as hereinafter fully described.

In the accompanying drawings, Figure I represents a vertical longitudinal section of a grate embodying my invention. Fig. II represents a plan or top View of a portion thereof. Fig. III represents a vertical crosssection thereof on the line w, Fig. I.

Similar letters of reference indicate similar parts.

The letter A indicates the movable gratebars, and B fixed grate-bars, usually two in number, resting on sills G at each end of the furnace, these sills also partly supporting the movable grate-bars.

The letter D indicates the rocking crossbar, which is located below the grate-bars at one end of the furnace. This rocking bar D is tted and supported in stirrups B, which are formed on the fixed grate-bars coincident to each other, and it engages each of the movable grate-bars A by means of lugs e e as follows: Each of a portion of -the series of movable grate-bars A is formed with a notch f in its lower edge to receive the lug e, which is on the upper edge of the rocking bar D, and each of another portion of the series of said movable bars alternating with the firstnamed portion thereof has an arm G, which is hook-shaped, projecting downwardly therefrom, in the upper edge of which arm is formed a notch j" to receive the lug c on the lower edge of the rocking bar, so that when motion is imparted to the rocking bar it acts in one direction on those bars having the notch f and in the other direction on the bars having the arm with the notch f', thereby imparting to the bars a reciprocating motion alternately in opposite directions. By this construction the operation of the movable grate-bars may be effected by the direct action of the rocking bar D and without the use of any extraneous connections--such as links-for that purpose.

The letter I indicates two stationary crossbars lying parallel to the rocking bar D at the opposite ends of the grate, each of which stationary bars is fitted and supported in stirrups B2 of the stationary grate-bars and which jointly form the main support for the movable grate-bars through the medium of balls o. One of the balls o is fitted loosely in each of a series of grooves o', which are formed in the upper part or surface of the stationary bars I transversely thereto, so as to extend parallel with the grate-bars, while each of the movable grate-bars A is formed with a baseplate p, resting on said balls, and by the ballbearing thus obtained the movable grate-bars may operate without friction under the impulse of the rocking bar. The base-plates p of adjacent movable grate-bars A are laterally in contact, or nearly so, with each other, and the movable bars on opposite sides of the fixed grate-bars B are also laterally in contact with base-plates p of said fixed bars, so that the assembled base-plates act as guides for the movable bars and also form shields to prevent access of ashes to the grooves o', containing the balls.

What I claim as new, and desire to secure by Letters Patent, is-

1. In a furnace-grate, the combination of longitudinally-movable grate-bars having alternately a notch in the lower edge thereof and a pendent hook-shaped arm with a notch in its upper edge, the rocking cross-bar having upwardly and downwardly projecting lugs, the former engaging said notches of the grate-bars and the latter engaging said notches of the arms thereof, and the fixed grate-bars supporting said rocking bar, substantially as herein described.

2. In a furnace-grate, the combination of longitudinally-movable grate-bars, the rocking cross-bar connected with said movable bars for operating the same, the two stationary cross-bars, each Ahaving on its upper part the transverse grooves, the balls litted loosely in said grooves of the stationary bars, the xed grate-bars supporting the rocking crossbar and also the stationary cross-bars, and the IOO tonary cross-bars, each having on its upper part the transverse grooves, the balls tted loosely in said grooves of the stationary bars, the xed grate-bars supporting the rocking cross-bar and also the stationary cross-bars, and the laterally-contacting base-plates of the movable and xed grate-bars, said plates of the movable grate-bars resting on said balls of the stationary cross-bars,substantially as herein described.

JOHN L. MASON. Witnesses:

CHAs. WAHLERS, JAS. S. EWBANK. 

